The `Twilight` heartthrob - who is currently dating his co-star Kristen Stewart- revealed he doesn`t understand why people find him attractive because he is addicted to M&Ms and thinks he will be hugely fat when he gets older.
He said: "I`m, like, a compulsiveeater. I`m going to be so fat when I`m older, it`s ridiculous."
Although Robert claims he is extremely boring he admitted he is a fan of troubled actor Charlie Sheen - who was recently admitted to hospital following a 36-hour drink and drugs binge with a bevy of porn stars - saying he admired the actor`s "little escapades".
He added to Vanity Fair magazine: "I like crazy people who don`t give a f**k. I`ve just kind of stopped doing everything. I never change the channel in my trailer. I just watch reruns of `House of Payne` and `Two and a Half Men`. God, I sound like such a loser."
While Robert was coy about his relationship with Kristen - who plays Bella Swan to his vampire Edward Cullen in the `Twilight` series - he revealed he admired her long before the pair first met.
He explained: "Kristen is very focused on being an actress. I mean, that`s what she is-she`s an actress. Whereas I-I just don`t really know.
"She`s cool. Even before I knew her I thought she was a really good actress. Like, I saw `Into the Wild`, and I thought she was really good in that. I still think there are very few girls in her class that are as good as she is."